Controllable Synthesis of Mesoporous Iron Oxide Nanoparticle Assemblies for Chemoselective Catalytic Reduction of Nitroarenes
作者:Ioannis T. Papadas、Stella Fountoulaki、Ioannis N. Lykakis、Gerasimos S. Armatas
DOI:10.1002/chem.201504685
日期:2016.3.18
electronics to magnetism, and catalysis. Recent efforts have targeted new nanostructured forms of Fe2O3 with high surface area‐to‐volume ratio and large pore volume. Herein, the synthesis of 3D mesoporousnetworks consisting of 4–5 nm γ‐Fe2O3 nanoparticles by a polymer‐assisted aggregating self‐assembly method is reported. Iron oxide assemblies obtained from the hybrid networks after heat treatment have
氧化铁(III)是一种低成本材料,其应用范围从电子学到磁学和催化学。最近的工作针对具有高表面积体积比和大孔体积的新型纳米结构Fe 2 O 3。在此,由4-5纳米γ -铁的三维中孔网络的合成2 ö 3报道由聚合物辅助聚集自组装方法的纳米颗粒。热处理后从混合网络中获得的氧化铁组件具有开孔结构,具有高表面积(最大167 m 2 g -1)和均匀的孔(约6.3 nm)。构成氧化铁纳米晶体可以从经历可控相变了γ-Fe 2ø 3到的α-Fe 2 ö 3和成Fe 3 ö 4不同退火条件下,同时保持三维结构和开放的孔隙。这些新的集成结构显示出高催化活性和稳定性,即使在大规模合成中,也可以选择性地将芳基和烷基硝基化合物还原为相应的芳基胺和肟。
Metal‐Free Deoxygenation of Chiral Nitroalkanes: An Easy Entry to α‐Substituted Enantiomerically Enriched Nitriles
mild and chemodivergent transformation involving nitroalkanes has been developed. Under optimized reaction conditions, in the presence of trichlorosilane and a tertiary amine, aliphatic nitroalkanes were selectively converted into amines or nitriles. Furthermore, when chiral β-substituted nitrocompounds were reacted, the stereochemical integrity of the stereocenter was maintained and α-functionalized
The azirine formation by LAH reduction of oximes has been extended to several types, such asandThe result was satisfactory to generalization of this reaction.